6.4.3
नामि
Operational rule vidhi
In presence of the नाम् प्रत्यय, the last letter of the अङ्ग becomes दीर्घ.
Word by word (padaccheda)
Right context नामि saptamī · ekavacana
- Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").
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Full reading
नामि
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The long vowel is substituted for the final of the stem before the Genitive 6th-Case plural affix नाम् (having the augment नुट्).
Karika
नामि दीर्घ आमि चेत्स्यात्कृते दीर्घे नुत् भवेत् ।
वचनाद्यत्र तन्नास्ति, नोपधायाश्च चर्म्मणाम् ॥
Thus अग्नीनाम्, वायूनाम्, कत्तॄणाम्, हर्त्तॄणाम् ॥ Theanuvritti of अण् 6.3.111 ceases. The augment नुट् 7.1.54 in नाम् is for the sake of the subsequent sutra; like 6.4.7. and the lengthening takes place after the addition of नुट् to the genitive affix आम् ॥ For if the lengthening took place before the addition of नुट्, there would be no occasion for नुट् which comes only after short stems.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.